Short bursts of exercise that last a few minutes a day – such as running for the bus – could slash the risk of conditions like arthritis , heart disease and dementia, a study suggests. Taking the stairs, playing actively with children or walking quickly between errands could all have health benefits, according to experts. The study, by researchers in China , included 96,408 people taking part in the UK Biobank study – who wore a device tracking their movement for a week. Experts compared the